package cn.edu.scau.cmi.luochenghao.chapter05;

class Tixing {
	double above, bottom, height;

	Tixing(double a, double b, double h) {
		above = a;
		bottom = b;
		height = h;
	}

	double getArea() {
		return (above + bottom) * height / 2;
	}
}

class People5_9 {
	double computerArea(Circle c) {
		double area = c.getArea();
		return area;
	}

	double computer(Tixing t) {
		double area = t.getArea();
		return area;
	}
}

public class Example5_9 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Circle circle = new Circle();
		circle.setRadius(196.87);
		Tixing lader = new Tixing(3,21,9);
		People5_9 zhang = new People5_9();
		System.out.println("zhang计算圆的面积：");
		double result=zhang.computerArea(circle);
		System.out.println(result);
		System.out.println("zhang计算梯形的面积：");
		result=zhang.computer(lader);
		System.out.println(result);
	}

}
